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參數(shù)資料
| 型號： | ADN2870 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | High Bandwidth, CMOS 8-Bit Serial Interface Multiplying D/A Converter; Package: MSOP; No of Pins: 10; Temperature Range: Industrial |
| 中文描述： | 3.3伏雙回路，50 Mbps至3.3 Gbps的激光二極管驅(qū)動器 |
| 文件頁數(shù)： | 16/20頁 |
| 文件大?。?/td> | 764K |
| 代理商： | ADN2870 |
ADN2870
LASER DIODE INTERFACING
The schematic in Figure 32 describes the recommended circuit
for interfacing the ADN2870 to most TO-Can or Coax lasers.
These lasers typically have impedances of 5 to 7 , and have
axial leads. The circuit shown works over the full range of data
rates from 155 Mbps to 3.3 Gbps including multirate operation
(with no change to PAVCAP and ERCAP values); see the
Typical Operating Characteristics for multirate performance
examples. Coax lasers have special characteristics that make
them difficult to interface to. They tend to have higher
inductance, and their impedance is not well controlled. The
circuit in Figure 32
operates by deliberately misterminating the
transmission line on the laser side, while providing a very high
quality matching network on the driver side. The impedance of
the driver side matching network is very flat versus frequency
and enables multirate operation. A series damping resistor
should not be used.
Rev. 0 | Page 16 of 20
0
L
BLMI8HG60ISN1D
C
100nF
R
P
24
ADN2870
IBIAS
CCBIAS
IMODP
VCC
L (0.5nH)
R 24
C 2.2pF
Tx LINE
30
Tx LINE
30
VCC
Figure 32. Recommended Interface for ADN2870 AC Coupling
The 30 transmission line used is a compromise between drive
current required and total power consumed. Other transmission
line values can be used, with some modification of the compo-
nent values. The R and C snubber values in Figure 32, 24 and
2.2 pF, respectively, represent a starting point and must be tuned
for the particular model of laser being used. R
P
, the pull-up
resistor is in series with a very small (0.5 nH) inductor. In some
cases, an inductor is not required or can be accommodated with
deliberate parasitic inductance, such as a thin trace or a via,
placed on the PC board.
Care should be taken to mount the laser as close as possible to
the PC board, minimizing the exposed lead length between the
laser can and the edge of the board. The axial lead of a coax
laser are very inductive (approximately 1 nH per mm). Long
exposed leads result in slower edge rates and reduced eye margin.
Recommended component layouts and gerber files are available
by contacting the factory. Note that the circuit in Figure 32 can
supply up to 56 mA of modulation current to the laser, sufficient
for most lasers available today. Higher currents can be accom-
modated by changing transmission lines and backmatch values;
contact factory for recommendations. This interface circuit is
not recommended for butterfly-style lasers or other lasers with
25 characteristic impedance. Instead, a 25 transmission line
and inductive (instead of resistive) pull-up is recommended;
contact the factory for recommendations.
The ADN2870 also supports differential drive schemes. These
can be particularly useful when driving VCSELs or other lasers
with slow fall times. Differential drive can be implemented by
adding a few extra components. A possible implementation is
shown in Figure 33.
0
L3 = 4.7nH
L4 = BLM18HG601SN1
V
CC
L6 = BLM18HG601SN1
SNUBBER SETTINGS: 40
AND 1.5pF, NOT OPTIMIZED,
OPTIMIZATION SHOULD CONSIDER PARASITIC.
L5 = 4.7nH
V
CC
R1 = 15
CCBIAS IBIAS
IMODN
IMODP
ADN2870
C1 = C2 = 100nF
20
TRANMISSION LINES
R1 = 15
(12 TO 24
)
R3
C3
SNUBBER
LIGHT
TOCAN/VCSEL
L1 = 0.5nH
L2 = 0.5nH
Figure 33. Recommended Differential Drive Circuit
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| ADN2870ACPZ-RL | 功能描述:IC LSR DRVR 3.3GPBS 3.6V 24LFCSP RoHS:是 類別:集成電路 (IC) >> PMIC - 激光驅(qū)動器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:60 系列:- 類型:激光二極管驅(qū)動器 數(shù)據(jù)速率:- 通道數(shù):4 電源電壓:3.3V 電流 - 電源:- 電流 - 調(diào)制:- 電流 - 偏置:- 工作溫度:0°C ~ 70°C 封裝/外殼:40-TQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:40-TQFN EP 包裝:托盤 安裝類型:表面貼裝 |
| ADN2870ACPZ-RL7 | 功能描述:IC LSR DRVR 3.3GPBS 3.6V 24LFCSP RoHS:是 類別:集成電路 (IC) >> PMIC - 激光驅(qū)動器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:60 系列:- 類型:激光二極管驅(qū)動器 數(shù)據(jù)速率:- 通道數(shù):4 電源電壓:3.3V 電流 - 電源:- 電流 - 調(diào)制:- 電流 - 偏置:- 工作溫度:0°C ~ 70°C 封裝/外殼:40-TQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:40-TQFN EP 包裝:托盤 安裝類型:表面貼裝 |
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